/**
* Copyright (c) 2025 Huawei Technologies Co., Ltd.
* This program is free software, you can redistribute it and/or modify it under the terms and conditions of
* CANN Open Software License Agreement Version 2.0 (the "License").
* Please refer to the License for details. You may not use this file except in compliance with the License.
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
* See LICENSE in the root of the software repository for the full text of the License.
*/

/*!
 * \file math_util.h
 * \brief
 */

#ifndef TILING_MATMUL_MATH_UTIL_H
#define TILING_MATMUL_MATH_UTIL_H

#include <array>
#include <cstdint>
#include <vector>
#include <utility>
namespace matmul_tiling {
class MathUtil {
public:
    static bool IsEqual(float leftValue, float rightValue);
    template<typename T>
    static auto CeilDivision(T num1, T num2) -> T
    {
        if (num2 == 0) {
            return 0;
        }
        return static_cast<T>((static_cast<int64_t>(num1) + static_cast<int64_t>(num2) - 1) /
            static_cast<int64_t>(num2));
    }
    template<typename T>
    static auto Align(T num1, T num2) -> T
    {
        return CeilDivision(num1, num2) * num2;
    }
    static int32_t AlignDown(int32_t num1, int32_t num2);
    static bool CheckMulOverflow(int32_t a, int32_t b, int32_t &c);
    static int32_t MapShape(int32_t shape, bool roundUpFlag = true);
    static void AddFactor(std::vector<int32_t> &dimsFactors, int32_t dim);
    static void GetFactorCnt(const int32_t shape, int32_t &factorCnt, const int32_t factorStart,
        const int32_t factorEnd);
    static void GetFactorLayerCnt(const int32_t shape, int32_t &factorCnt, const int32_t factorStart,
        const int32_t factorEnd);
    static bool CheckFactorNumSatisfy(const int32_t dim);
    static int32_t FindBestSingleCore(const int32_t oriShape, const int32_t mappedShape, const int32_t coreNum,
        bool isKDim);
    static void GetFactors(std::vector<int32_t> &factorList, int32_t srcNum, int32_t minFactor, int32_t maxFactor);
    static void GetFactors(std::vector<int32_t> &factorList, int32_t srcNum, int32_t maxFactor);
    static void GetBlockFactors(std::vector<int32_t> &factorList, const int32_t oriShape, const int32_t mpShape,
        const int32_t coreNum, const int32_t maxNum);
    static int32_t GetNonFactorMap(std::vector<int32_t> &factorList, int32_t srcNum, int32_t maxFactor);
    static std::vector<std::pair<int, int>> GetFactorPairs(int32_t num);
    static std::pair<int32_t, int32_t> DivideIntoMainAndTail(int32_t num, int32_t divisor);
};
} // namespace matmul_tiling
#endif // _MATH_UTIL_H_